From: Christoph Hellwig <hch@lst.de>
To: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
James Bottomley <james.bottomley@hansenpartnership.com>,
linux-scsi@vger.kernel.org,
Sathya Prakash <sathya.prakash@broadcom.com>,
Kashyap Desai <kashyap.desai@broadcom.com>,
mpt-fusionlinux.pdl@broadcom.com
Subject: Re: [PATCH 00/10] mpt3sas: full mq support
Date: Tue, 7 Feb 2017 16:34:46 +0100 [thread overview]
Message-ID: <20170207153446.GA22228@lst.de> (raw)
In-Reply-To: <eb606203-9adf-4200-ae1c-7f518342f863@suse.de>
On Tue, Feb 07, 2017 at 03:38:51PM +0100, Hannes Reinecke wrote:
> The SCSI passthrough commands pass in pre-formatted SGLs, so the driver
> just has to map them.
> If we were converting that we first have to re-format the
> (driver-specific) SGLs into linux sg lists, only to have them converted
> back into driver-specific ones once queuecommand is called.
> You sure it's worth the effort?
>
> The driver already reserves some tags for precisely this use-case, so it
> won't conflict with normal I/O operation.
> So where's the problem with that?
If it was an entirely separate path that would be easy, but it's
not - see all the poking into the tag maps that your patch 8
includes. If it was just a few tags on the side not interacting
with the scsi or blk-mq it wouldn't be such a problem.
next prev parent reply other threads:[~2017-02-07 15:34 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-31 9:25 [PATCH 00/10] mpt3sas: full mq support Hannes Reinecke
2017-01-31 9:25 ` [PATCH 01/10] mpt3sas: switch to pci_alloc_irq_vectors Hannes Reinecke
2017-02-07 13:15 ` Christoph Hellwig
2017-02-16 9:32 ` Sreekanth Reddy
2017-02-16 10:01 ` Hannes Reinecke
2017-01-31 9:25 ` [PATCH 02/10] mpt3sas: set default value for cb_idx Hannes Reinecke
2017-02-07 13:15 ` Christoph Hellwig
2017-01-31 9:25 ` [PATCH 03/10] mpt3sas: implement _dechain_st() Hannes Reinecke
2017-02-07 13:15 ` Christoph Hellwig
2017-02-07 13:18 ` Hannes Reinecke
2017-01-31 9:25 ` [PATCH 04/10] mpt3sas: separate out _base_recovery_check() Hannes Reinecke
2017-02-07 13:16 ` Christoph Hellwig
2017-02-16 9:53 ` Sreekanth Reddy
2017-02-16 10:03 ` Hannes Reinecke
2017-01-31 9:25 ` [PATCH 05/10] mpt3sas: open-code _scsih_scsi_lookup_get() Hannes Reinecke
2017-02-07 13:16 ` Christoph Hellwig
2017-02-16 9:59 ` Sreekanth Reddy
2017-02-16 10:04 ` Hannes Reinecke
2017-01-31 9:25 ` [PATCH 06/10] mpt3sas: Introduce mpt3sas_get_st_from_smid() Hannes Reinecke
2017-02-07 13:17 ` Christoph Hellwig
2017-01-31 9:25 ` [PATCH 07/10] mpt3sas: use hi-priority queue for TMFs Hannes Reinecke
2017-02-07 13:19 ` Christoph Hellwig
2017-02-16 10:09 ` Sreekanth Reddy
2017-02-16 10:14 ` Hannes Reinecke
2017-02-16 10:23 ` Sreekanth Reddy
2017-02-16 10:26 ` Hannes Reinecke
2017-01-31 9:25 ` [PATCH 08/10] mpt3sas: lockless command submission for scsi-mq Hannes Reinecke
2017-01-31 13:22 ` Christoph Hellwig
2017-01-31 13:46 ` Hannes Reinecke
2017-01-31 14:24 ` Christoph Hellwig
2017-01-31 9:25 ` [PATCH 09/10] mpt3sas: Use 'msix_index' as argument for put_smid functions Hannes Reinecke
2017-01-31 9:26 ` [PATCH 10/10] mpt3sas: scsi-mq interrupt steering Hannes Reinecke
2017-01-31 10:05 ` Christoph Hellwig
2017-01-31 10:02 ` [PATCH 00/10] mpt3sas: full mq support Christoph Hellwig
2017-01-31 11:16 ` Hannes Reinecke
2017-01-31 17:54 ` Kashyap Desai
2017-02-01 6:51 ` Hannes Reinecke
2017-02-01 7:07 ` Kashyap Desai
2017-02-01 7:43 ` Hannes Reinecke
2017-02-09 13:03 ` Sreekanth Reddy
2017-02-09 13:12 ` Hannes Reinecke
2017-02-10 4:43 ` Sreekanth Reddy
2017-02-10 6:59 ` Hannes Reinecke
2017-02-13 6:15 ` Sreekanth Reddy
2017-02-13 13:11 ` Hannes Reinecke
2017-02-15 8:27 ` Sreekanth Reddy
2017-02-15 9:18 ` Kashyap Desai
2017-02-15 10:05 ` Hannes Reinecke
2017-02-16 9:48 ` Kashyap Desai
2017-02-16 10:18 ` Hannes Reinecke
2017-02-16 10:45 ` Kashyap Desai
2017-02-07 13:19 ` Christoph Hellwig
2017-02-07 14:38 ` Hannes Reinecke
2017-02-07 15:34 ` Christoph Hellwig [this message]
2017-02-07 15:39 ` Hannes Reinecke
2017-02-07 15:40 ` Christoph Hellwig
2017-02-07 15:49 ` Hannes Reinecke
2017-02-15 8:15 ` Christoph Hellwig
2017-02-15 8:19 ` Hannes Reinecke
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